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Levodopa. Molecular model of the drug levodopa (C9.H11.N.O4), also known as L-DOPA (L-3,4-dihydroxyphenylalanine). This drug is used in the treatment of Parkinson's disease and dopamine-responsive dystonia. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white), nitrogen (blue) and oxygen (red). Illustration.